Question 1

Please help,, thankyou!

Question 2

Answer:

Shown in the picture

Question 3

$:\implies\bf\:m+n=18\:\longrightarrow\:(I)$

$:\implies\sf\:2mn=-24\:\longrightarrow\:(II)$

$:\implies\bf\:mn=-12\:\longrightarrow\:(III)$

Answer - A :

$:\implies\tt\:(5)/(3m)+(5)/(3n)$

$:\implies\tt\:(15(m+n))/(9(mn))$

$:\implies\tt\:(15(18))/(9(-12))$

$:\implies\tt\:-(15)/(6)$

$:\implies\:\boxed{\bf{\purple{-(5)/(2)}}}$

Answer - B :

$:\implies\tt\:(4)/(m^2)+(4)/(n^2)$

$:\implies\tt\:(4(m^2+n^2))/((mn)^2)$

$:\implies\tt\:(4(m^2+2mn+n^2-2mn))/((mn)^2)$

$:\implies\tt\:(4[(m+n)^2-2mn])/((mn)^2)$

$:\implies\tt\:(4[(18)^2-(-24)])/((-12)^2)$

$:\implies\tt\:(4(324+24))/(144)$

$:\implies\tt\:(348)/(36)$

$:\implies\:\boxed{\bf{\orange{(29)/(3)}}}$

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